From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Paul Eggert Newsgroups: gmane.emacs.devel Subject: Re: Using the GNU GMP Library for Bignums in Emacs Date: Tue, 10 Jul 2018 20:30:51 -0700 Organization: UCLA Computer Science Department Message-ID: <75af00ba-3e41-7edb-2619-8311f912dfe2@cs.ucla.edu> References: <29f933ac-a6bf-8742-66a7-0a9d6d3e5a88@disroot.org> <83bmecy6fx.fsf@gnu.org> <0d3175d8-d996-651e-b221-71978bde3a65@cs.ucla.edu> <87tvpdnzgy.fsf@tromey.com> <4c2a814f-c254-29e5-39cf-11b5f2e5c9c8@cs.ucla.edu> <49d8ba62-c9a5-9203-d882-8e900b441ff3@cs.ucla.edu> <8e0320d9-e0d0-2b57-57cc-2df4399f133c@cs.ucla.edu> <87lgaio7xd.fsf@tromey.com> <9ee4b3c6-9d87-a8e6-7e07-455da91c8966@cs.ucla.edu> NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Trace: blaine.gmane.org 1531279789 10167 195.159.176.226 (11 Jul 2018 03:29:49 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 11 Jul 2018 03:29:49 +0000 (UTC) User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 Cc: Tom Tromey , emacs-devel@gnu.org To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Jul 11 05:29:45 2018 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1fd5p2-0002ZK-LI for ged-emacs-devel@m.gmane.org; Wed, 11 Jul 2018 05:29:44 +0200 Original-Received: from localhost ([::1]:51472 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fd5r9-00018e-9W for ged-emacs-devel@m.gmane.org; Tue, 10 Jul 2018 23:31:55 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:41156) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fd5qE-00018K-OF for emacs-devel@gnu.org; Tue, 10 Jul 2018 23:30:59 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fd5qB-0007WA-KR for emacs-devel@gnu.org; Tue, 10 Jul 2018 23:30:58 -0400 Original-Received: from zimbra.cs.ucla.edu ([131.179.128.68]:43036) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fd5qB-0007Vc-B2 for emacs-devel@gnu.org; Tue, 10 Jul 2018 23:30:55 -0400 Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id A41CC160779; Tue, 10 Jul 2018 20:30:53 -0700 (PDT) Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10032) with ESMTP id S_IwnV5B-yFc; Tue, 10 Jul 2018 20:30:52 -0700 (PDT) Original-Received: from localhost (localhost [127.0.0.1]) by zimbra.cs.ucla.edu (Postfix) with ESMTP id D5AB1160980; Tue, 10 Jul 2018 20:30:52 -0700 (PDT) X-Virus-Scanned: amavisd-new at zimbra.cs.ucla.edu Original-Received: from zimbra.cs.ucla.edu ([127.0.0.1]) by localhost (zimbra.cs.ucla.edu [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id GAZQQWU9X-vP; Tue, 10 Jul 2018 20:30:52 -0700 (PDT) Original-Received: from [192.168.1.9] (unknown [47.154.30.119]) by zimbra.cs.ucla.edu (Postfix) with ESMTPSA id 82641160779; Tue, 10 Jul 2018 20:30:52 -0700 (PDT) Openpgp: preference=signencrypt Autocrypt: addr=eggert@cs.ucla.edu; prefer-encrypt=mutual; keydata= xsFNBEyAcmQBEADAAyH2xoTu7ppG5D3a8FMZEon74dCvc4+q1XA2J2tBy2pwaTqfhpxxdGA9 Jj50UJ3PD4bSUEgN8tLZ0san47l5XTAFLi2456ciSl5m8sKaHlGdt9XmAAtmXqeZVIYX/UFS 96fDzf4xhEmm/y7LbYEPQdUdxu47xA5KhTYp5bltF3WYDz1Ygd7gx07Auwp7iw7eNvnoDTAl KAl8KYDZzbDNCQGEbpY3efZIvPdeI+FWQN4W+kghy+P6au6PrIIhYraeua7XDdb2LS1en3Ss mE3QjqfRqI/A2ue8JMwsvXe/WK38Ezs6x74iTaqI3AFH6ilAhDqpMnd/msSESNFt76DiO1ZK QMr9amVPknjfPmJISqdhgB1DlEdw34sROf6V8mZw0xfqT6PKE46LcFefzs0kbg4GORf8vjG2 Sf1tk5eU8MBiyN/bZ03bKNjNYMpODDQQwuP84kYLkX2wBxxMAhBxwbDVZudzxDZJ1C2VXujC OJVxq2kljBM9ETYuUGqd75AW2LXrLw6+MuIsHFAYAgRr7+KcwDgBAfwhPBYX34nSSiHlmLC+ KaHLeCLF5ZI2vKm3HEeCTtlOg7xZEONgwzL+fdKo+D6SoC8RRxJKs8a3sVfI4t6CnrQzvJbB n6gxdgCu5i29J1QCYrCYvql2UyFPAK+do99/1jOXT4m2836j1wARAQABzSBQYXVsIEVnZ2Vy dCA8ZWdnZXJ0QGNzLnVjbGEuZWR1PsLBfgQTAQIAKAUCTIByZAIbAwUJEswDAAYLCQgHAwIG FQgCCQoLBBYCAwECH In-Reply-To: Content-Language: en-US X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 131.179.128.68 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:227238 Archived-At: Stefan Monnier wrote: > There's no need to explain the difference between `integer` and `bignum= ` > here, just like we don't explain the difference between `subr` and > `compiled-function`. subr and compiled-functions are distinct (nonintersecting) types, whereas= bignum=20 is a subset of integer, so these are quite different cases. The manual sa= ys=20 "each object belongs to one and only one primitive type; =E2=80=98type-of= =E2=80=99 tells you=20 which one". But if type-of returned 'integer' and bignums are integers (w= hich=20 they should be), this statement in the manual would become false, and wou= ld need=20 to be rewritten. I don't see this as a win. > I think I'm missing a reality check here. We are talking about > `type-of`, right? Have you looked at how many times it's used in Elisp= ? True, it's pretty rare. And it is a relic of the old-fashioned days when = types=20 were all disjoint. (Maybe we should remove 'type-of'? :-) I'm not all that worried about type-of. I am more worried about the idea = that=20 bignums are second-class integers. When at all possible, bignums should b= e=20 treated the same way that any other (large) integer is treated. For examp= le,=20 aref should report that a bignum index is out of range (if it is indeed o= ut of=20 range) rather than reporting a type error.